Neodymium-142 evidence for Hadean mafic crust |
| |
| Authors: | O'Neil Jonathan Carlson Richard W Francis Don Stevenson Ross K |
| |
| Institution: | Earth and Planetary Sciences Department, McGill University, 3450 University Street, Montreal, Quebec, H3A 2A7, Canada. oneil_jo@eps.mcgill.ca |
| |
| Abstract: | Neodymium-142 data for rocks from the Nuvvuagittuq greenstone belt in northern Quebec, Canada, show that some rock types have lower 142Nd/144Nd ratios than the terrestrial standard (epsilon142Nd = -0.07 to -0.15). Within a mafic amphibolite unit, 142Nd/144Nd ratios correlate positively with Sm/Nd ratios and produce a 146Sm-142Nd isochron with an age of 4280(-81)(+53) million years. These rocks thus sample incompatible-element-enriched material formed shortly after Earth formation and may represent the oldest preserved crustal section on Earth. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
